Klingons that is all KOR KOLOTH AND KANG !!! but get three really good actors to play them and chuck in cumberbatch as well !!!

Or maybe, finally a decent Romulan story. Give a nod to Balance of Terror? Redefine that bird of prey as a special project in response to the Narada? Show some Romulan perspective, reacting to one of their descendants destroying Vulcan?